feat: IMAP mail sync with thread-to-contact matching (PRD §6.1)

Real IMAP connection via imapflow library:
- Connects to IMAP server (IMAPFlow, TLS on port 993)
- Fetches recent messages (configurable limit, default 20)
- Extracts: from, fromEmail, subject, date, snippet (200 chars)
- Thread-to-contact matching (PRD §6.1):
  1. Match sender email against persons table
  2. If no person match, extract domain and match against company.website
  3. Returns matchedCompany + matchedPerson for each email
- Audit-logged (action: crm.mailsync:imap)
- Zod validated (host, port, user, password, folder, limit)
- 502 on IMAP connection failure with detail
- 400 on validation failure

Tested: invalid creds → 502 'IMAP connection failed', missing host → 400

skills/resume-builder/references/keywords/finance.txt

@@ -0,0 +1,50 @@
+DCF
+LBO
+Comps
+M&A
+IPO
+Pitchbook
+Bloomberg
+Capital IQ
+Wind
+Choice
+财务建模
+估值
+敏感性分析
+行业研究
+deal
+路演
+招股书
+投资逻辑
+catalyst
+催化剂
+风险点
+ROE
+ROIC
+EBITDA
+PE
+PB
+EV
+sizing
+case interview
+hypothesis
+MECE
+issue tree
+PowerPoint
+Excel 高阶
+VBA
+SQL
+Python
+CFA
+CPA
+FRM
+ACCA
+PMP
+量化
+策略
+回测
+因子
+基本面
+技术面
+夏普
+最大回撤